Spread about 2 tablespoons ketchup or chili sauce evenly over top of meat. If your microwave has a temperature probe, insert it so tip is in center of food. Cover tightly with plastic wrap, arranging loosely around probe to vent. If not using a probe, cover tightly and then vent 1 edge slightly.

Microwave on medium high for 26-28 minutes, or until probe reaches 170 degrees. Let meat loaf stand for 10 minutes before serving.